No.. could it be..?
02-05-2015, 09:12 PM
#126
02-06-2015, 05:34 AM
#128
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So the f1 engine I have in the pic,(second one without a pipe,RIRE) with the 170* timing, does that mean it'll run with a straight mini pipe? Is that how they ran them in f1 racing?
02-06-2015, 04:25 PM
#129
Smokn, It will run with a straight mini pipe, but it will require high pressure, like crankcase pressure, or bladder pressure. Muffler pressure won't be sufficient. And yes that is how they were run in the Formula 1 event. The mini pipe is good for a small boost, but very loud, so if you are required to run some sort of a muffler where you fly, a tuned pipe can be used, and if everything is set up just right, you can expect only a small boost. Also keep in mind that in the formula one days NITRO was king. We typically used 50, 60, and 70% nitro, but we also burned up a lot of "iron", or aluminum. You can probably have all the fun you can stand with 40% nitro, and you are only giving up less the 1000 rpm's. Good luck, Greg
02-06-2015, 10:40 PM
#132
02-07-2015, 10:02 AM
#133
Q-40 was developed as a replacement for 15 size Quarter Midget, which at the time had become a regional event. Formula-1 was in decline also, at the time, and Q-40 replaced it too. So it wasn't a rules change, but rather a new event replacing one that was dying. F-1 was very loud, and some people thought if mufflers were required, it might save the event, but others argued that tuned pipes would just add another level of difficulty. Q-40 engine rules were based on AMA Quickie 500, Event 428: side exhaust engines with mufflers (tuned mufflers!) on 15% nitro. It didn't take long for modelers, and engine manufacturers to learn that the cleaner Q-40 air-frames could benefit from a slightly different port timing, so we ended up with two different engines for event's 422 (Q-40),and 428 (Q-500). Without looking at your engine, I couldn't say for sure, but it's either a F-1 engine, or an alcohol FAI engine, and I'm about 90% convinced it's a Formula-1 engine. Greg
02-07-2015, 10:19 AM
#134
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I think you're saying that in the latter stages of Form 1 mufflers were required? I thought that was what happened but I have no real history of the event. This engine would be consistent with that change, but not sure why the carb.
If it was an FAI engine I would not expect the carb, plus a full tuned pipe.
As I said in a recent email to someone, I am sure the engine was not designed to go slowly and it ought to be fun for something.
If it was an FAI engine I would not expect the carb, plus a full tuned pipe.
As I said in a recent email to someone, I am sure the engine was not designed to go slowly and it ought to be fun for something.
02-07-2015, 02:25 PM
#135
Nope, Mufflers were never allowed in F-1 because it would have given a boost, and then everyone would have had to have one to be competitive. Do you know for sure that the engine has a carburetor that can be throttled, or is it a straight venturi, and just being called a "carburetor"? From the looks of the picture of 4 engines, it looks like there is something stuffed in the carburetor hole in the rear cover. Can't really tell from the angle. Greg
02-07-2015, 09:47 PM
#138
Well my bad! I thought the picture was of your engines. Your engine is even more interesting. It's definitely not a Formula 1 engine, and I've used up a lot of computer "type" guessing what you have. I think it's a sport version, based on the FAI crankcase. The reason I think that it is related to the FAI engine is because of the extra set of mounting lugs. It should be a blast of fun, because it will go like heck, and still idle. Two years ago Dave Shadel modified an OS 60 carburetor for an old short stroke Nelson Quickie 500 engine for me. I used it at Vic Welland's Carolina Speed Rally in Hudson, NC. It broke 150 mph without a lot of preliminary work. It would be similar to your engine, except that it is side exhaust. Neat! Greg
02-08-2015, 05:55 AM
#139
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No worries. I was starting to think it might be one of the sport derivatives I'd heard of from time to time. The lugs had me wondering too, I've only seen those on FAI .40s and F2A engines.
02-10-2015, 09:54 AM
#140
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MJD,
That appears to be a Perry carb from a K&B 7.5 DF engine or some other "pumped" engine. Be sure to anchor the aluminum idle disc after setting your idle as it tends to spin from vibration-messing up your idle. I use CA glue or silicone sealant for this. Don't expect a low tick over idle with the carb and engine. Also, install a short length of silicone fuel tubing between the needle valve and the idle disc to prevent drifting due to engine vibration. Finally, note that virtually all Perry carbs are subject to problems due to dirty fuel and it is mandatory to use a quality fuel filter between the tank and carb. These recommendations evolved from over a decade of experience of operating this carb in glow DF and "Animal 500" pylon applications. Good luck with this engine and it should work very well for you.
Rgds,
Art
That appears to be a Perry carb from a K&B 7.5 DF engine or some other "pumped" engine. Be sure to anchor the aluminum idle disc after setting your idle as it tends to spin from vibration-messing up your idle. I use CA glue or silicone sealant for this. Don't expect a low tick over idle with the carb and engine. Also, install a short length of silicone fuel tubing between the needle valve and the idle disc to prevent drifting due to engine vibration. Finally, note that virtually all Perry carbs are subject to problems due to dirty fuel and it is mandatory to use a quality fuel filter between the tank and carb. These recommendations evolved from over a decade of experience of operating this carb in glow DF and "Animal 500" pylon applications. Good luck with this engine and it should work very well for you.
Rgds,
Art
02-10-2015, 11:17 AM
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Shouldn't be a pump carb with only a muffler pressure tap though, or it would go lean mid-range. I suspect it is a large bore regular carb, but in any case that is fine with me, I have two Perry carbed engines and I get along okay with those. But they're not on quite such a beast of an engine. I'll deal with the vibration mod on the needle for sure.
02-10-2015, 12:33 PM
#143
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Yeah, whatever it turns out to be exactly, wasn't designed to go slow. Either a "sport" engine or maybe a training version of a racing engine - I dunno. But I do know it wasn't in the mail today, but I got my Cox parts finally.
And the other package I am eagerly awaiting is the transmitter tray from Esprit.. I think the girl comes with it, it was worth it to find out. 2015 is the year I finally get a tray.. yippee.. I'll give it to my wife so she can give it to me for Valentine's Day, that'll buy me some grace on the Visa bill.
And the other package I am eagerly awaiting is the transmitter tray from Esprit.. I think the girl comes with it, it was worth it to find out. 2015 is the year I finally get a tray.. yippee.. I'll give it to my wife so she can give it to me for Valentine's Day, that'll buy me some grace on the Visa bill.
02-10-2015, 02:05 PM
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And the Nelson: it looks like a late F3D FIRE case, with a Q40 muffler can and a carb. If the carb is big enough and the liner is timed in the 190 degree plus area, it should haul.
If it is what I think it is, don't expect much of an idle...these are cold natured engines...
If it is what I think it is, don't expect much of an idle...these are cold natured engines...
02-10-2015, 02:20 PM
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MJD,
Granted, the Perry carb could be either a large bore version or "pump" carb- the large bore carb throat diameter is .275 " while the pump version measures .370". I just miked my own carbs.
Either carb will run fine with muffler or crankcase pressure, the only difference that the idle will be compromised with crank pressure. Note that I flew the "pump" carb with tuned pipe pressure (same as muffler pressure) for many years and was able to achieve a reliable idle about 6K RPM with a good transition to high speed. Again, this engine should satisfy your Extreme Speed requirements very well.
Rgds,
Art
Granted, the Perry carb could be either a large bore version or "pump" carb- the large bore carb throat diameter is .275 " while the pump version measures .370". I just miked my own carbs.
Either carb will run fine with muffler or crankcase pressure, the only difference that the idle will be compromised with crank pressure. Note that I flew the "pump" carb with tuned pipe pressure (same as muffler pressure) for many years and was able to achieve a reliable idle about 6K RPM with a good transition to high speed. Again, this engine should satisfy your Extreme Speed requirements very well.
Rgds,
Art
02-10-2015, 09:47 PM
#149
The carburetor I used on my SS Nelson (Q-500/Q-40) is an OS .60 "7M" Dave Shadel cut it so it would fit the crankcase. It measures .370" with a thin sleeve in the bore. The biggest problem is you cannot keep it from shaking, and coming loose. Dave told me to JB Weld it, but I didn't! Dummy me! It took about a dozen runs before it shook loose. It didn't fall out, but would wiggle. It idled as well or better then any sport engine. Actually, it was a ***** cat! I never tached it at idle, because there was no need to. Greg